|"Are you a wizard or not?"
The title of this article is conjectural. Although it is based on canonical information, the actual name is conjecture and may be supplanted at any time by additional information released from canonical sources. If this occurs, please move this page to the appropriate title.
|"I show not your face but your heart's desire."|
The spell to turn Scabbers yellow is a nonsensical and made up spell by Fred Weasley that supposedly changes Scabbers' colour to yellow, but does not have such effect, as it is completely made up, and nothing would happen.
It is also possible that the reason the spell would not work is due to the fact that Scabbers isn't really a true rat.